Pire box for boilers



Sept 2511928.

R. M. SPENCER Fnmox PoR Bu'nms Original Filed July 20, 1 926 vill A lill :IIIZ

`Reissued UNITED STATES PATENT j OFFICE.

f ROBERT MARVIN SPENCER, OF.WAYCROSS, GEORGIA.

FIRE nox ioB. BoILERs.

` Original No. 1,622,356, datedl March 29, 1997,4 Serial No. 123,708, filed July 20, 19u26.

reissue filed AMarch 22, 1928. Serial No. 263,822.

of: construction that will be fully hereinafterl described and particularly claimed.

In the drawingu Figure 1 represents a vertical sectional View of the fire box of a boiler furnace,

Figure 2 is a transverse sectional view thereof, and

Figure 3 is an end elevation lof one of 'the` forward hollow blocks.

Referring to the drawing in detail, it will be seen that the numeral 5 designates the fire box of the boiler which is pro-vided with theA usual doorway 6 through the water space of the boiler. A

From the forward lend of the ire box the usual fire lues4 7 extend through which the products of combustion pass on their way into the smoke stack.

In the bottom of the fire box, is a grate (not shown), which may be of any preferred or desirable construction. lArranged entire,- ly within the fire box between the grate and the fire lines are al plurality of pipes 8 forming an arch support. The arch is formed in three. sections which are similar in construction and, therefore, only one section will be described in detail. y

Each section includes a forward endihollow block 9 which has one end open at l() and its bottom open as at 11. The intermediate `hollow blocks l2 have both ends opened and are closed at their sides, tops and bott-oms. The rear end block 14 has its ends opened and its rear end is beveled as is indicated at 15,

and is disposed'in spacedrelation to the rear wall of the fire box. The sides, top and bottom of this block 14 are closed.

The blocks 9, 12 and lahave their' bottom corners notchedlongitudinally to receive the arch pipes 8. The arch pipes communicate `with the water space around the fire box.

sections before -entering the fire flues. gas, which is preferably forced in under pres- Application for Thek water in these arch pipes prevents them from being overheated which is essential as otherwise the weight of the arch would cause t-he pipes to bend and sag when subjectedv to the usual intense heat in the fire box.

In operation, it will be observed, all of vthe l smoke and gases of combustion are compelled to pass to the forward end ofthe fire box and then up through the flues formed by the arch The sure, entering the flues from the forward ends *of the arch sections, is heated'while passing through the arch, thereby consuming the smoke and gases.

l It is to be noted that this arch structure may be made very cheaply and yetstrong and durable. The structure is exceedingly simple, yet eiiicientl and reliable. The present embodiment ofthe invention, however, has been disclosed in detailmerely by way of ex- Aample because in `actual practice it attains the features of advantages enumerated as desirablel in the statement of the invention and the above description. 'u

It is apparent thatchanges in the details ofconstruction, and in the combination and `arrangement of parts may be resorted to without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what l y I claim as new is: u u

In combination with a boiler fire box, longitudinally extending arch pipes between the fire containing portion of the fire'box and the y fire i'lues t-hereof,a plurality of arch sections of hollow construction mounted on said arch pipes, each section including a plurality of hollow blocks, the intermediate blocks being open ended, and the front block having one open end adjacent the next .intermediate blockand an openbot'tom, and the other end block'whaving open ends one of which is beveled. y

`ROBERT M.V SPENCER. 

